7 
longer transversely than longitudinally: socket balls large, 
perforated, placed on elevated bases: glenoid circles radiately 
crenulated: muscular areas concave, broadish, surrounded 
with an elliptical border of small tubercles in a single series. 
Two kinds of spines occur in the same beds containing this 
fossil: the one is thick, long, transversely ridged, and marked 
with broken longitudinal lines; the mesial line of the ridges 
is ornamented with a row of granules: and the other is much 
smaller and finely longitudinally striated. Perhaps the former 
belongs to the “ socket balls,” and the latter to the “ small 
tubercles.” Tunstall Hill and Humbleton quarry. 
Lingula mytiloides, J. Sowerby. This species occurs in the 
marl slate of Ferry Hill, Midderidge, and Thrislington Gap. 
Orbicula speluncaria , Schl. It occurs in the marl slate of 
Thrislington, and in the magnesian limestone of Tunstall 
Hill. 
Terebratula elongata, Schl. Common. 
Terebratula sufflata, Schl. Common. 
Camerophoria Schlotheimi, Yon Buch. Common. 
Camerophoria globulina, Phillips.— Terebratula id., Phill., 
“Encyclopeedia Metropolitana,” “ Geology,” pi. 3., fig. 3. 
Rather common. 
Camerophoria multiplicata , n. sp. Sub triangular, some¬ 
what pointed behind, rounded in front, and a little wider 
than long: dorsal valve with a round incurved beak, slightly- 
inclined lateral surfaces, and a broad deep flattened mesial 
furrow : ventral valve with strongly-inclined lateral surfaces, 
and a wide prominent flattened mesial ridge: both valves with 
numerous small obtuse folds, from five to eight in the furrow, 
and seven or more on the lateral surfaces. It differs from C. 
Schlotheimi in having smaller, and a greater number of folds : 
it also attains a larger size. Humbleton and Dalton-le-dale. 
Spirifer convolutus, Phillips. Humbleton. 
Spirifer alatus, Schl.— Spirifer undulatus , J. de C. Sowerby. 
Midderidge, Humbleton, and Tunstall Hill. 
Spirifer Permianus, n. sp. Form semi-elliptical, twice as 
wide as long: lateral surfaces with four or more sharpish 
